Free tool · no signup
CIS deduction calculator.
Subcontractor in the Construction Industry Scheme? Your contractor deducts tax at source from the labour portion of every invoice. Work out exactly what will be deducted — and what you’ll actually receive — before you raise the invoice.
Labour portion of your invoice, excluding VAT.
Optional. Materials listed separately on the invoice are exempt from CIS.
Enter the labour amount to see your CIS deduction and what you’ll be paid.
Stop tracking CIS in a spreadsheet
Track every deduction automatically.
Honest Invoices splits labour and materials on every invoice, calculates the CIS deduction at source, and keeps a running total of what you’re owed back from HMRC — ready for year-end. £15/month, locked.
How this is calculated
- CIS applies to the labour portion only when materials are itemised separately on the invoice. Otherwise the whole amount is treated as labour.
- 20% deducted if you’re registered with HMRC for CIS.
- 30% deducted if you’re not registered — register at gov.uk to drop to 20%.
- 0% if you’ve been granted Gross Payment Status (you pay your own tax in Self Assessment instead).
- VAT is excluded from the deduction calculation — enter amounts net of VAT.
- Authority: GOV.UK — Construction Industry Scheme.
- This is a guide, not tax advice. Your actual tax position depends on your circumstances.